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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f2ac62a137d00ea6e8d6210fc934486971278f079720e4f142fc88b7eb31a9' 
  AND token = 'sBjPJpIK5nI4emWx/vGLn8n8V8Z0eRbKF5nwd2cplwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}